diff --git a/tinyfilemanager.php b/tinyfilemanager.php
index 71786c9..6f55502 100644
--- a/tinyfilemanager.php
+++ b/tinyfilemanager.php
@@ -245,7 +245,11 @@ if (defined('FM_EMBED')) {
 
 //Generating CSRF Token
 if (empty($_SESSION['token'])) {
-    $_SESSION['token'] = bin2hex(random_bytes(32));
+    if (function_exists('random_bytes')) {
+        $_SESSION['token'] = bin2hex(random_bytes(32));
+    } else {
+    	$_SESSION['token'] = bin2hex(openssl_random_pseudo_bytes(32));
+    }
 }
 
 if (empty($auth_users)) {